Logitech keycap letters are horribly weak

The ASCE keys and others wear out way too quickly on QWERTY keyboards.  I can't help but believe that Logitech knows this with the hopes for consumers to repurchase keyboards over and over.
I purchased water applied decals but those didn't stay on more that a day.

So I purchased a new keyboard and, this time, coated it with Rustoleum clear primer.   I cut open the bag the keyboard came in and tape around the keys to avoid spraying on the special function keys and the palm rest pad.  You can see the spray lines.

Hopefully this will lock in the factory lettering permanently.   I'll know in about 8 months of use if this experiment worked.